/* 基础样式和重置 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
}